OFFSET
3,2
COMMENTS
It seems that a(9)=137 and a(n) = A007678(n) for all even n.
LINKS
Vladimir Letsko, Illustration of all cases for number of sides from 3 to 8
Vladimir Letsko, Illustration of all cases for number of sides from 3 to 8 [Cached copy, pdf version only]
Vladimir Letsko, Proof for n = 7 and n = 8 and example for n = 9 (in Russian)
Vladimir Letsko, Proof for n = 7 and n = 8 and example for n = 9 (in Russian). [Cached copy, pdf version only]
V. A. Letsko, M. A. Voronina, Classification of convex polygons, Grani Poznaniya, 1(11), 2011. (in Russian)
B. Poonen and M. Rubinstein, The number of intersection points made by the diagonals of a regular polygon.
CROSSREFS
KEYWORD
hard,more,nonn,nice
AUTHOR
Vladimir Letsko, May 29 2009, May 30 2009, Apr 20 2010
STATUS
approved